Sweet build going on in Corona, CA using Second Skin sound and heat insulation to give the driver some relief from that HUGE engine on his back. Damplifier Pro (CLD) to kill the vibration and Luxury Liner Pro (MLV) to help tame down some of that engine noise and thermally insulate. Can you guess what vehicle is being built here?

If they ran the sub amp with high level inputs tapped off of speakers in the car sometimes when the factory stereo turns off there is no more dampening of the factory speakers and they act as microphones placing the subwoofer into a runaway feedback loop. Common with cheap install places like Best Buy.

Hey I'm always looking for ways to sell decals, signs, banners, or photo services. I sold 10 6" decals last week when a kid outside of class was talking about wanting a logo for his jetski. Quick 120 bucks.
J

I'm still finding stuff and going through all the paperwork, but here is a short list:
BBK longtubes
BBK O/R X-pipe
Flowmaster catback
Boss 302 Intake
JLT "cold air"
BBK throttle body
C&L mass air meter
Throttle sensitivity adjuster
Eibach Pro suspension kit. This includes springs/dampers/ and bushings at all four corners plus larger front and rear sway bars.
BMR upper control arm mount, upper control arm, and lower control arms.
BMR panhard bar
JLT catch can
4:10 ring/pinion
SCT livewire tuning by Brenspeed
Several other things I've not yet found.
Luckily, all this has been professionally installed and tuned by a well-known Mustang speed shop which is actually only a one hour drive.

It effectively takes a 3dB increase in power to hear a difference. This is a doubling of power. Unfortunately, you won't really gain much. I gather from your post you are looking for more output. Honestly, as great as that driver is, it's not much a beast in the way of sheer output. It's a sealed driver only, so you're only other option is a larger enclosure at the sacrifice of power handling and cone control, so that just screws everything else.